Amazon's ChoiceGreat Value

Boss

BOSS Coffee by Suntory

NO.1 CANNED COFFEE BRAND IN JAPAN - Conveniently found in vending machines and convenience stores across the country, Suntory has innovated BOSS Coffee for over 30 years to become the no.1 canned coffee brand in Japan (2021, Intage).

8.6 /10
★★★★☆ Highly Recommended Overall Score · 80% expert / 20% community Ranked #696 of 1193 (Top 59%)
Our Coffee Score 8.4
Coffee Lovers Score 9.2
Overall Ranked #696 of 1193 (Top 59%)
Ready-to-Drink Coffee Ranked #50 of 109 (Top 46%)
Our Coffee Score Ranked #764 of 1193 (Top 65%)
Coffee Lovers Ranked #409 of 1193 (Top 35%)

Our verdict: Ranked #46 of our top 109 ready-to-drink coffee — an outstanding medium-dark pick, earning a 4.6★ average across 1,122 Amazon ratings.

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Key facts

Roast
Medium-Dark
Origin
Guatemala
Process
Roasted
Size
6 oz
Price / oz
$7.67
Best for
Ready to Drink, Espresso

Flavor notes

The Coffee Score review

NO.1 CANNED COFFEE BRAND IN JAPAN - Conveniently found in vending machines and convenience stores across the country, Suntory has innovated BOSS Coffee for over 30 years to become the no.1 canned coffee brand in Japan (2021, Intage). Our team spent hands-on time with the BOSS Coffee by Suntory to see how it holds up against the rest of the ready-to-drink coffee we've tested.

Across repeated sessions we evaluated it on the categories that matter most: quality, consistency, value, and how likely we are to reach for it again. Ranked #46 of our top 109 ready-to-drink coffee — an outstanding medium-dark pick, earning a 4.6★ average across 1,122 Amazon ratings.

From the roaster

  • NO.1 CANNED COFFEE BRAND IN JAPAN - Conveniently found in vending machines and convenience stores across the country, Suntory has innovated BOSS Coffee for over 30 years to become the no.1 canned coffee brand in Japan (2021, Intage).
  • RAINBOW MOUNTAIN BLEND - Using beans sourced from seven grow regions managed by Guatemalan Coffee Association farmers, Suntory’s expert brewers blend the unique flavors produced in diverse climates to create our signature Rainbow Mountain Blend.
  • STRAIGHT FROM JAPAN - Due to popular demand from BOSS fans, we are delighted to bring Rainbow Mountain Blend, with the same great packaging and flavor as in Japan, to the US market. Enjoy an authentic taste of Japanese coffee culture.
  • READY TO DRINK COFFEE - Rainbow Mountain's 6 fl.oz can is perfect to slip into a pocket or bag and take on-the-go for a high quality coffee pick-me-up anytime, anywhere.
  • NATURALLY BREWED CAFFEINE - With only 70 calories and 110mg of naturally brewed caffeine, don't underestimate this handy can size. Rainbow Mountain Blend packs the equivalent of a doubleshot of espresso in every can, more than enough to get you going.

What we liked

  • Strong overall Coffee Score of 8.4/10 — ranked #696 of 1193 (59% percentile).
  • Distinct flavor profile: .
  • Community agrees — a Coffee Lovers Score of 9.2/10 from 1,122 ratings.

How we graded this coffee

Grading framework
Taste 40% weight 8.7
Freshness 20% weight 9.6
Bean Quality & Sourcing 15% weight 9.6
Value 15% weight 4.3
Roast Quality 10% weight 9
Our Coffee Score (experts, 80% of overall) 8.4/10

The Coffee Lovers Score

Averages 4.6★ from 1,122 verified Amazon shoppers.

5 star 79%
4 star 12%
3 star 5%
2 star 2%
1 star 2%
  • Pru Verified purchase ★★★★★

    Delish! Worth Every Penny, No Doubt!

    Not quite as pristine as the black but still so yummy. They call it BOSS for good reason… it leads head and shoulders above the rest! Slightly smokey, clean and smooth. Perfect pick me up treat in the afternoon. I regret nothing!

  • David Verified purchase ★★★★★

    Refilled my HEAT gauge.

    Bought this as a fan of Yakuza, got made a fan of BOSS coffee. Genuinely, insanely good coffee that beats the hell out of Starbucks RTD's which by my estimation, are far more concerned with sugar than coffee.

    1 found this helpful

  • Michael Ben Verified purchase ★★★★★

    My favorite beverage on the face of the earth

    Was never a coffee person until I went to Japan. I’ve tried Starbucks, Dunkin, local coffee houses near me, and sure I like a hot chocolate every now and then, but never could I get into coffee. The bitterness was always too much.

    29 found this helpful

  • Jacob Verified purchase ★★★★☆

    Great Flavor. Shipping Damage.

    It’s awesome to finally try one of Japan’s greatest vending machine drinks. The flavor is nice and it offers that nice Kick of caffeine. The cans however did arrive with a numerous amount of dents and dings. The can has a strong thick build of aluminum so it was still fine.

Read all 1,122 reviews on Amazon